Every person has a White Whale they want to land. its the reason why some people invent Electric Cars, or run for Governor, or climb El Cap
The question "Why do it" is answered in the depths of the sublimity of the human spirit - which sometimes rises so much far above the normal that it seems so alien as to be super-human
But its the same human spirit which lies buried in the heart of us all and Dawn Wall is the storytelling of the kindling of that spirit over 6 years of single minded pursuit of greatness
of how Tommy Caldwell and Kevin Jorgeson turned their sweat tears and blood into expanding the boundary of what is "humanly possible"
One should see this movie purely for the joy of the triumph of human spirit over the Dawn Wall
Anything is Possible - when you have the audacity to imagine and the will to follow up